Tractor gearing



G. W. DUWHAM.

TRACTOR GEARING. ,nafmcATloN min x,vmzeo, 1G20. 'i il Patentedlune i3, 1922.

2 SHEETS-SHEET l.

G. W. DUNHAM.

TRACTOR GEAHING.

APPucATsoN FILED LAN. 30, m2o.

LIM* 9) 2%@ D Paented Jun@ 13, i922.

2 SHEETS- SHEET 2.

' had therein to the accompanying GEORGE iw. DUNHAM,

the transmission housing of the tractor' Ming the transmission embodying my invencniree arabes TNT 5F10 0F NEW YORK, N. Y., ASSIGNOR TO GRAHAM BROTHERS 0F EVANSVILLE, INDIANA, A CORPORATION OF INDIANA TRACTOR GEARING.

Specification of Letters Patent. Patgnted June 13 1922 Application filed January 30, 1920. Serial No. 355,156.

To all whom it may concern Be it known that LGnoacii lV. DUNHAM, a citizen ofthe United States of America, residino at New York, in the county of Newk York and State of New York, have invented certain new and useful Improvements in yllractor Gearing, of which the following is a specification, reference being drawings.

The invention relates to tractors and refers more particularly to the arrangement of the transmission. One object of the invention is to so arrange the transmission first that the length of the tractor can be greatly decreased and second that the weight of the transmission will be substantially located forward of'the drive shafts to assist in preventing the tractor from tilting backwardly. Other' objects of the invention reside in the. novel arrangements and combination of parts as more fully hereinafter set forth.

In the drawings:

Figure 1 is a horizontal section through tion;

Figure 2 is a central longitudinal section therethrough g Figure 3 is a sectional elevation showing a` portion of the rear axle.

1 is the transmission housing and Q and 3 the drive lshafts forming 'the rear axle. These shafts are aligned stub shafts having ltheir inner ends spaced from each other and each stub shaft is journalled near its inner end in a suitable bearing L1 in the transmission housing and near its outer end in a suitable bearing 5 in one of theoppositelyextending housing extensions 6 which are referably formed separately from and bolted to the sides of the transmission hous- 4 ing 1 at 7.` The hubs 8 of the tractor drive wheels 9 are adjacent to the bearings 5.

10 is the transmission main drive shaft which is yformed of the sections 11, 1Q and 13 non-rotatably secured to each other by means of the sleeves 14 upon adjacent ends of the rear section 11 and intermediate section 1Q and front section 13. The front section 413 is adapted to be operatively connected to the trac-tor engine. The rear section 11 extends between the inner ends of the stub drive shafts 2 and 3. 15 is the transshowmission counter-shaft located between the inner' ends-of the stubidi'ive shafts and (arrying the multiple change-speed wears 16 and 17 which aie splined thereto`v These gears are preferably integral and form the groove 18 therebetween which is engaged bv the shifter fork 1S) for moving tlliewgears.

20 and 21 are cooperating multiple changespeed gears fixedly mounted upon the rear section 11 of the main drive shaft. these gears being adapted for engagement respectively with the gears 1G and 17T.

l`he shifter fork 19 is mounted upon the shifter rod 22 which loiigitudiiiallv slidablv engages 11i bearings in the transmission housing 1. fIh'e shifter rod 22 is provided with the servies of recesses 23 at one end engageable by the spring'pressed detent 21 for yieldably locating the shifter rod in its adjusted positions. Q5 is a shifter lever for actuating the shifter fork and its rod. this shifter lever being pivotally mounted in the cap or extension 26 bolted upon thetransmission housing 1.

27 and 28 are jack shafts located forward of the stub drive shafts 2 and 3 and rotatably mounted in suitable bearings 29 and 30 in the transmission housing 1. These jack shafts are preferably below the transmission main drive shaft 10 which extends thereover. 31 is the differential gearing mounted upon the adjacent ends of the jack shafts and connected thereto, this differential gearing being adapted to be driven bv the bevel pinion 32 upon the foi-ward cnil of the counter-shaft 15. 33 are pinioiis or s pur gears non-rotatably secured' upon the jack shafts as by being splined thereto, and located between the bearings 29 and 30. Thesepinions or spur gears are in mesh with the gear -wheels 34 keyed upon the inner ends ofthe stub drive shafts, the hubs of the gear wheels being adjacent the bearings 4.

From .the above description it will be readily seen that due to having the multiple housing is decreased b having the differential gearing located orward of the drive shafts instead of inrear of the same.

lVhat I claim as my invention is:

l. The combination with drive shafts in substantial alignment with each-other and having their inner ends spaced, of jack shafts located forward of said drive shafts,

gear wheels upon the inner ends of said drive shafts and pinions upon said jack shafts engaging said gear'wheels, differen* tial gearing upon the adjacent endsD of said jack shafts, a main drive shaft adapted for connection with an engine, and extending over said differential gearing and having its rear portion extending betweeny the inner 2. The combination With a transmission housing7 of substantially aligned drive shafts jonrnalled in said housing and having their inner ends extending'inwardly beyond the journals and spaced from each other, jack shafts located forward of said drive shafts,

gear Wheels upon the inner ends vof said drive shafts, pinions upon said jack shafts engaging said gear wheels, differential gearing upon the adjacent ends of said jack c shafts, a main drive shaft adapted for connection with an engine and extending over said differentialgearing and having its rear portion extending between the inner ends of said drive shafts, a counter-shaft in substantial parallelism with said main drive shaft, means for driving said counter shaft from said maindrive shaft7 and a `pinion upon the forward end of said counter-shaft and in drivingengagement with said differential gearing.

In testimony whereof I affix my signature.

GEORGE W. DUNHAM. 

